JPS5851051A - Construction for cooling rotary type hydraulic cylinder - Google Patents

Abstract

PURPOSE:To increase cooling effect of a rotary hydraulic cylinder by feeding the working oil circulated through the sleeve body and inside the sleeve cooling the sleeve body with a fan installed at a rotary valve. CONSTITUTION:The working oil supplied through an oiling hole 24 provided in the sleeve body 13 is introduced to the oil line 25 through two or more oil lines 25C furnished by cutting the periphery of a rotary valve 5 and further led to an oil chamber 27 from the oil line 25 through a lock mechanism 6 and another oil line 26. Accordingly, the working oil is supplied in circulation through sleeve body 13 and inside the sleeve 14, making the cooling of rotary joint part. This cooling action of sleeve body 13 is further encouraged by installing a fan 29 at the rotary valve 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to increase the cooling effect of a rotary hydraulic cylinder for chavking installed in a machine tool.

This is a proposal regarding the structure of a rotary hydraulic cylinder that is effective in minimizing the rise in hydraulic oil temperature.

The present applicant has previously proposed several such rotary hydraulic cylinders, and the present invention relates to improvements on these rotary hydraulic cylinders, and is an excellent rotary hydraulic cylinder structure that has not been seen in the past. It is also very effective in downsizing. Also 50('
Even if the bearing is rotated at a high speed of 1OR, P, M or higher, the heat generation of the bearing can be suppressed to a constant temperature.

A specific example of implementation will be described based on the drawings. 1st
The figure is a partially cutaway perspective view of the entire mounting device, and FIG. 2 is a longitudinal sectional view of the entire device.

In the figure, 1 is a cylinder, 2 is a piston rod, and 3 is a piston fixed on the piston rod 2, which is slidably fitted into a cavity 4 of the cylinder 1. 5 is a rotating pulp that is inserted into the piston rod 2,
A lock mechanism 6.6 that locks oil flow in a part of the inlet
' is assembled and connected to the cylinder 1 using bolts 7. 8.9 and 10 are O-rings for maintaining airtightness.

Reference numeral 11 denotes a guide pin fixed to the piston 3, and either end P or P' of the guide pin is always guided into a guide pin hole 12 provided in the cylinder l or the rotary valve 5 (in the illustrated example, on the cylinder side). As a result, free rotation of the piston rod 2 is restricted.

In the illustrated example, the right end threaded part of the piston rod 2 is
The chuck body is connected to a jib (none of which are shown) of the chuck body to move the jib.

On the other hand, the rotary valve 5 has a two-step conical outer shape with 1, K
2, and a sleeve body 13 is provided at the lower stage. A sleeve 14 is provided inside the sleeve body 13 in the following manner. That is, the sleeve 14
One of the bearings 15 and 15' (15 in the illustrated example) fitted into both ends of the sleeve 14 is brought into direct contact with the inner wall of the sleeve 14, and the other bearing (15' in the illustrated example) is attached to the bolt 1G.
The sleeve cover 17 is brought into contact with the inner wall of the sleeve cover 17 which is joined to the sleeve body 1; The sleeve cover and the space between the two facing each other are formed in a convex and convex shape with a labyrinth seal structure.The oil that enters from the outside is discharged to the outside from the oil drain groove 20, whereas the oil leaks from the inside. The oil is collected through the oil drain groove 21 into the drain reservoir 22 inside the sleeve body 13. At this time, in order to easily and reliably separate and distinguish between the oil discharge and collection, the sleeve cover is installed. 17 is equipped with an air plug 2:(.

Next, the operation of the piston 3 within the cylinder 1 will be explained as follows.
This is done as follows. External supply device (not shown)
The hydraulic oil in the oil tank is in the sleeve body]: (Oil filler port 2.
1, the oil passage 25 passes through the lock mechanism, and the oil passage 26 passes through the lock mechanism.
, is guided to the oil chamber 27, and moves the piston 3 from the right side to the left side in the drawing. The JJl oil in the oil chamber 27' that is pushed out as the piston 3 moves passes through the opening/pull mechanism 6', the oil passage 25', and is recovered from the oil drain ports 2 and 1' to the external supply device. be.

When the forward stroke of the piston as described above is completed and the piston moves to the backward stroke, the above-mentioned drained oil 1124' is transferred to the oil filler port 2 and the oil filler port 2.
1 is changed by switching a switching valve (not shown) so that it becomes an oil drain port, and the return process is performed in a similar reverse path circuit. At this time, a small amount of hydraulic oil is supplied to the bearings 15.15' on both sides through the gaps T, T' between the rotary valve 5 and the sleeve 1.
After lubricating the oil tank 15', it is collected through the drain reservoir 22 to an external supply device (oil tank). 'At this time, a communication hole f is opened inside the sleeve 14 to communicate the oil drain passages fl and f2, so that a balance in the amount of oil supplied to both bearings 1, 5, and 15' is maintained. .

The hydraulic oil circuit described above grasps a workpiece (not shown) in one hand, and machining the workpiece is performed. When this machining continues, the heat energy generated due to the high speed rotation of the rotary valve 5 is absorbed by the oil passages 25, 25',
2f3.2+1'' and the hydraulic oil in the oil chamber 27.27' to raise the oil temperature.The main sources of thermal energy are: ■ Shear heat in the rotating parts of the hydraulic oil; ■Frictional heat of the bearing and agitation heat of the hydraulic oil in the core, ■Conversion heat due to pressure oil leakage of the hydraulic oil, etc.

The rise in oil temperature due to this generated heat reduces the viscosity of the hydraulic oil, or causes the piston rod to vibrate slightly due to expansion and deformation of the parts due to the heating. Furthermore, the oil leakage becomes larger and causes a loss of hydraulic energy, and this loss also causes troubles such as weakening the gripping force of the chucking device and reducing machining accuracy. be. In the present invention, the oil temperature is reduced by 1 due to this generated heat.
- In order to prevent the temperature of the entire equipment and oil from rising, it is possible to prevent the temperature of the entire device and the oil from rising by modifying the rotating joint or by using a cooling fan.

The invention of such a rotating joint will be explained with reference to FIG. 3 and FIG. 1. 3 is a sectional view taken along the Z-Z line in FIG. 2, and FIG. 4 is a perspective view of the sleeve 1. As is clear from the figure, the sleeve 1 has one annular oil passage 25a and one annular oil passage 25'a.
The oil passages 25b and 2 are provided around the entire circumference of the main body, and communicate with the oil passage at appropriate locations.
5'b are perforated radially. A plurality of oil passages 2 are formed by cutting the outer periphery of the rotary valve 5 so as to open corresponding to one or more openings of the oil passages.
5 C125C1... and 25'C12+>' C1・
・ are respectively arranged, and the oil passage 256 is provided with the oil passage 25.
However, the oil passages 25' are open and communicated with the oil passages 25'c (the example in Fig. 3 has three oil passages 25C (25'C) and two oil passages 25 (25')). is shown). The sealing material, loss, TLx, and R3 are O-rings for preventing oil leakage from the oil passage 25a125'a, and the set screw 11
As a result, the sleeve body 13 and the sleeve 1 are fixed in a non-rotatable manner. When the sleeve body 13 and the sleeve 14 are fixed by shrink fitting, the O-rings R1 and R
2. It is also possible to omit FL3 and set screw U to create a compact structure. Note that the oil passage 25''%2+)'!l and the sealing material 'R11R2, 'R3+7) groove may also be provided in the body 13.

However, the hydraulic oil supplied through the inlet 24 passes through the annular oil passage 2511 and into numerous oil passages 25b, 25b, .
・It is connected to oil road 250 through either oil road nif
The oil is fed to the oil passage 25 shown below. On the other hand? f:I
The waste oil pushed out to the oil passage 25 of TtC is guided to the oil passage 25'C, and then passes through a number of oil passages 25'b, 25/b,...
The oil is returned to the annular oil passage 25'a through either of the oil passages 024' and collected into the oil tank via the drain oil 024'. In this way, the hydraulic oil is transferred to the sleeve body 13 and the sleeve 11.
In addition to being effective in cooling the rotary joint, the hydraulic pressure of the hydraulic oil supplied to the rotary valve 5 acts in a radial direction and is advantageous in that it does not act on uneven load conditions. There is. Therefore, the oil path is 25 ”% 25 ”%
It is preferable that the oil passages 25'11, 25/B, . 5
It is important to install it at multiple locations so that it does not receive unbalanced loads.

Next, an example in which a cooling fan is used to forcibly cool the sleeve body 13 by wind action will be explained with reference to FIGS. 5 and 6. 29 is a fan;
The position of the rotary valve 5 to which 9 is attached is +
A cylindrical cover 30 having a bent flange Q is attached to the front surface of the door 29 which is a recess and allows air to flow into the needle-like stepped portion along the recess 1. As a result, outside air is forced to flow from the front surface of the cylinder 1 to the conical stepped portion 1 of the rotary valve 5 toward the rear of the sleeve body 13. 31 is a fan, and 32 is a bolt for mounting the cylindrical cover.

In implementation, the inside of the cylindrical cover 30 is made into a hollow structure,
When an endothermic agent is enclosed in the hollow interior or circulated, a more effective cooling effect is achieved. In addition,
(33.3=1) When the fan 29 is made into a variable pitch structure, when the fan 29 is fixed on the needle of a rotary valve, or when the cylindrical cover 30 is fixed on the fin, the perforated sleeve) 33.3=1
(Refer to Figure No. and Figure 6) It is preferable that the amount of air intake gap n: (5) be changed as appropriate by fixing while sliding.

The structure of the fan 2S3 shown in FIG. 5 is such that a plurality of blades 21 are attached in parallel in the same direction as the piston rod on the outer peripheral surface of 29 g, which has the same inner diameter as the upper part of the rotary valve 5. The features of this fan are that it has a simple structure, can be manufactured at low cost, and is excellent in that it does not change the direction of air blowing by changing the direction of rotation through forward and reverse rotation. Note that a large number of fins 36 are provided on the outer peripheral surface of the sleeve body 13 and are parallel to each other in the cylinder length direction that is parallel to the piston rod 2, and these fins are effective in promoting the cooling effect.

With the configuration described in -1- below, the outside air always initially flows along the outer peripheral surface of the cylinder 2, which cools the cylinder itself in advance and contributes to lowering the oil temperature of the hydraulic oil in the oil passage and inside the cylinder. be. Furthermore, as described above, providing a needle-like step or fins increases the area of contact with the cooling air, so that a more effective cooling effect can be exerted. Especially the air intake of the cylindrical cover 31.
The endothermic action in the vicinity of 1:<5 is preferable because the piston's operation within the cylinder is not affected by heat, and this is an excellent feature in terms of T-making accuracy as the cylinder pressing force does not change. .

In addition, thermal energy generated near the sleeve 14 in the sleeve body 13 and the bearing lnl 10' is
Normally, heat is conducted toward the rotating cylinder, but as mentioned above, the direction in which the cooling air flows is opposite to the direction in which heat propagates, so the heat propagation is effectively blocked. It's what you do. The above heat increases proportionally as the rotational speed increases, but the flow of cooling air also increases in intensity, so a synchronized cooling effect can be obtained.

Furthermore, this forced cooling effect does not require a separate drive source for the fan, and furthermore, no means for controlling the rotation speed is required. Note that the fan itself also has a heat dissipation function indirectly as fins.

-1- In the explanation described above, the needle-shaped stepped portions Kl and K2 formed on the rotary valve 5 were described as being provided in a state of descending toward the side of the sleeve body 13. Depending on the size and other factors, it is also possible to create a state in which the stages are ascending or a state in which there are no stages.

As is clear from the above explanation, great effects can be obtained simply by devising the four-way contact oil passage, but by using a cooling fan in combination, extremely excellent cooling action and effectiveness can be achieved. This is a promising proposal, and is expected to be one that will be able to cope with the future trend toward higher rotation speeds for rotary hydraulic cylinders.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the rotary hydraulic cylinder, Fig. 2 is a longitudinal sectional view of the entire cylinder, Fig. 3 is a Z-Z sectional view of Fig. 2, Fig. 4 is a partially cutaway perspective view of the sleeve, Figure 5 is a perspective view of the fan.
Fig. 5 is a perspective view of the cylindrical cover. body) 14
... Oil passage block (sleeve) 15 ... Bearing 2X) ... Fan 30 ...
・Cylindrical cover 3 ()...Fin patent applicant
Kitayo Tetsu I-Sho Figure 1 Kuku 2nd 3rd 2R Figure 4

Claims (1)

[Claims] In a rotary hydraulic cylinder consisting of a rotary body with a built-in piston that can reciprocate, and a hydraulic oil supply body that penetrates an oil passage block in which an oil passage is bored to supply hydraulic oil to the piston in the rotary body. The oil passage block is provided with a large number of radial oil passages communicating with an annular oil passage provided on the outer periphery of the block, and openings corresponding to one or more of the openings of the large number of oil passages. A plurality of oil passages are provided on a part of the outer periphery of the rotating body, and a large number of fins are attached to the outside of the hydraulic oil supply body, and a plurality of fins are installed on the edge facing the rotating body in the inward direction. A cylindrical cover having a bent rim is attached so as to cover a part of the outer peripheral surface of the rotating body, and a fan that rotates together with the rotating body 11 is attached to the outer circumference of the rotating body within the covered cover. 1. A rotary hydraulic cylinder characterized in that an air inlet having a constant gap of 1-i is formed between the cover and the bent flange edge of the cover.